I heard this question on, of all places, Dr.Phil. He was posing this question to the teenage girl in the Dr.Phil Family when she was interviewing potential adoptive parents. But, this question will also work when interviewing any doctor or midwife:
"Is there anything that I haven't asked that you would ask if you were in my shoes?"
Now, the response should be something along the lines of, "Do you respect the patient's decisions they make about their regarding procedures or tests?" or "Do you consider all pregnancies a natural and normal process unless proven otherwise?" or "What percentage of your clients have c-sections?"
Now, if they refuse to answer or change the subject, then you are not in the right place. End of story.
I wonder what would happen if most women started asking this question...Would it force doctors to confess that all those interventions are not necessary?